微波消解-石墨炉原子吸收法测定新鲜樱桃中 铜含量

Determination of copper content in fresh cherry by microwave diges-tion-graphite furnace atomic absorption spectrometry

中文关键词:  微波消解  铜  石墨炉原子吸收  新鲜樱桃

英文关键词:microwave digestion  copper  graphite furnace atomic absorption  fresh cherry

中文摘要:

      目的 建立基于微波消解的前处理方法, 使用石墨炉原子吸收法检测新鲜樱桃中铜含量的方法。 方法 采用微波消解法对新鲜樱桃样品进行前处理消解, 消解好的溶液使用石墨炉原子吸收光谱对其中的铜元素含量进行定量测定。同时进行方法检出限、精密度、回收率的测试。结果 本试验确定的最佳消化条件为: 樱桃样品的称样质量为2 g, 由8 mL HNO3和2 mL H2O2组成的混合酸试剂。测得樱桃中铜含量为0.27 mg/kg~4.32 mg/kg, 超过96%的样品含量小于2.0 mg/kg, 铜元素含量没有超过标准的要求。实际样品回收率97.7%~103.5%, 检出限0.236 μg/L, 相对标准偏差1.06%。结论 该方法测定新鲜樱桃中的铜含量操作简便, 准确, 方法检出限、精密度、回收率均能满足实际的分析检测要求, 测定结果准确可靠, 可作为测定樱桃中的铜含量的方法之一。

英文摘要:

      Objective To establish a method for the determination of copper content in fresh cherry by microwave digestion-graphite furnace atomic absorption spectrophotometry. Methods Cherry was digested by microwave digestion, and determined copper content by atomic absorption spectrophotometer equipped with graphite furnace. The detection limits, precision and recovery rate were verified under preferred conditions. Results The optimum conditions for the determination of this experiment included the following aspects: 2 g quality of sample, mixed acid reagent consisting of 8 mL HNO3 and 2 mL H2O2. Copper content in cherry were ranged from 0.27 mg/kg to 4.32 mg/kg. More than 96% of the sample content was less than 2.0 mg/kg. The content of copper element was lower than the limit value of the national standard. The recovery rate of samples was between 97.7%~103.5%. The method detection limit was 0.236 μg/L. The relative standard deviation (RSD) of the method was 1.06%. Conclusion The advantages of this method are simple and accurate. From the detection limit, precision, recovery rate and the accuracy of the results, the method can be used for the detection of copper content in real samples.